TriboDyn TRI-EX² 75W-140 Full Synthetic Gear Oil
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TriboDyn Tri-EX² 75W-140 is a full synthetic gear oil engineered with patented ceramic coating technology — the first oil to receive a United States Functional Patent in over 30 years. This heavy-duty formulation combines advanced synthetic base stocks with a robust sulfur-phosphorus extreme pressure additive package, friction modifier, and proprietary ceramic coating technology that actively seeks out areas of intense heat and friction to form a self-lubricating ceramic film.
This film not only prevents wear but can help repair minor surface damage, delivering unmatched load-carrying capability and extended component life. Meeting or exceeding API GL-5, API MT-1, MIL-PRF-2105E/D, Mack GO-J, and Mack GO-H specifications, Tri-EX² 75W-140 is ideal for heavy-duty truck differentials, towing applications, and high-torque gearboxes requiring maximum film strength.
With excellent low-temperature performance, thermal stability, anti-foam, anti-rust, and anti-corrosion properties, this gear oil delivers proven performance in the most demanding conditions.
Key Benefits:
- Patented ceramic coating technology that helps repair minor surface damage
- Full synthetic 75W-140 for heavy-duty applications
- Excellent extreme pressure and load-carrying capability
- Broad OEM approvals (API, MIL, Mack)
- Strong cold-flow and thermal stability
- Reduces wear and extends component life under severe conditions
Recommended Applications: Ideal for heavy-duty truck differentials, towing, high-torque gearboxes, and other demanding applications where maximum protection and potential surface repair benefits are required.
Technical Specifications – TriboDyn® Tri-Ex2 75W-140 Full Synthetic Gear Oil
Viscosity @ 100°C (ASTM D445): 27.3 cSt
Viscosity @ 40°C (ASTM D445): 194.75 cSt
Viscosity Index (ASTM D2270): 178
Pour Point (ASTM D97): -34.6°F (-37°C)
API Gravity (ASTM D4052): 27.3
EP Weld Load (ASTM D2783): 800 kg
Scar Diameter @ 400 kg Load (ASTM D2783): 1.27 mm
Coefficient of Friction @ 400 kg (ASTM D2783): 0.088
Recommended for use where the following specifications are required:
API MT-1, API GL-5, Eaton PS-386, PS-164 Rev 7, Navistar/International TMS 6816, Mack TO-A Plus, Meritor O-81, ZF Freedomline, MIL-PRF-2105E / MIL-PRF-2105D, Mack GO-J & GO-H, Meritor-076M.
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Why TriboDyn TRI-EX2 75W-140 is the ultimate gear oil
Patented Ceramic Coating Technology
Under extreme heat and pressure, the patented ceramic coating actively forms a self-lubricating protective film on metal surfaces, seeking out high-friction areas for superior boundary-layer protection.
Extreme Pressure & Shock Load Protection
Advanced sulfur-phosphorus EP additives combined with ceramic technology deliver unmatched protection under heavy towing, high torque, and severe shock loading conditions.
Highest Film Strength & Wear Protection
Superior film strength creates a durable barrier that dramatically reduces metal-to-metal contact, minimizing wear and extending gear and bearing life.
Cooler Operation & Longer Gear Life
Significantly lowers operating temperatures while providing exceptional thermal and oxidative stability, resulting in smoother performance and reduced maintenance costs.
Verified Reviews
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Meets or Exceeds Demanding Industry Specifications
API GL-5 • API MT-1 • MIL-PRF-2105E/D • Mack GO-J/GO-H • Eaton PS-386 • Meritor O-81 • ZF Freedomline • Navistar TMS 6816 • Patented Ceramic Coating Technology
100% Customer Satisfaction
Hundreds of 5-star reviews • Perfect 100% rating on eBay for over 5 years. You are buying the worlds best oil, our shipping speed, packing, and service is 2nd to none.
Made in the USA
Exclusively manufactured in our own ISO 9001 certified facility. Unmatched purity and quality in every drop.
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Safety Data Sheet (SDS)
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Frequently Asked Questions
It contains patented ceramic coating technology that actively forms a self-lubricating protective film on metal surfaces under extreme heat and pressure — something standard gear oils simply cannot do.
The ceramic coating seeks out areas of high friction and heat, bonding to the metal to dramatically reduce wear, lower operating temperatures, and provide superior boundary-layer protection even during dry starts or heavy loads.
Yes. TRI-EX² 75W-140 meets or exceeds API GL-5, API MT-1, MIL-PRF-2105E/D, Mack GO-J/GO-H, Eaton PS-386, Meritor O-81, ZF Freedomline, and Navistar TMS 6816.
Most customers report quieter operation, smoother shifting, and significantly lower differential temperatures almost immediately, along with improved fuel mileage and longer gear life.
We do not recommend Tri-Ex2 Gear Oil for Limited Slip differentials. We offer Tri-EX Limited Slip Gear Oils for these applications. It comes with the Limited Slip Additive blended in for maximum performance.
All TriboDyn TRI-EX² gear oils are proudly manufactured in our own ISO 9001 certified facility in the United States by a team of experienced tribologists who have engineered lubricants for aerospace, racing, and heavy industry for decades.
